The WLAN standard body defined how the channel centre frequency would be computed and provided formulae to compute the centre frequency for various channel bonding operations. The below tabular column and examples from the 802.11ac standard depict this operation. For a more detailed explanation – refer channelization section (22.3.14 Channelization) in the 802.11ac standard.
Fig Courtesy: 802.11acTM Standard
The values for the above tabular column fields are obtained from the VHT/HT capability/operation elements, The Formulae for computing the centre frequency is
Fig Courtesy: 802.11acTM Standard
The formula for the centre frequency of the primary 20 MHz channel is provided below
Fig Courtesy: 802.11acTM Standard
A few examples as shown in the standard according to the equation 22-102 and equation 22-103 are provided below
